Multi-functional design: Measures PH, EC, TDS, and temperature. Simply immerse the electrode in water for quick readings on the LCD screen. Compact and eco-friendly. Detachable probe: High-precision sensor with fast response. Easy to carry, store, and replace. Hold function: Locks stable readings. Press again to reset. Auto temperature compensation: Adjusts for accuracy when moving from air to water (range: 0.1-60��C or 32-140��F). Auto power-off and clear display: Backlit LCD for visibility. Powers off after 135 seconds of inactivity. Shows 4-digit readings with units. Note: Slight color or size variations may occur but do not affect performance. Includes: 1 �� PH Meter 3 �� Calibration Powder 1 �� English Manual Display differences may cause slight color variations. Measurement tolerance: ��1-3cm.